Return the calling workspace's own brand profiles — the entities you create under Atria's brand-management UI. Each carries the brand id, name, industries, logo, website, color palette and fonts.

Use the returned id as brand_id for the image generation endpoints. An item with over_plan_limit=true sits above the workspace's plan limit for brand profiles, which a downgrade can leave behind: it stays listed, but POST /image-generations refuses it with code=40301 until the workspace upgrades or deletes another brand profile. These are workspace-owned profiles.

Returns: code=0 success; code=40001 workspace context missing.